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Received for publication November 11, 1971. Scientific Journal Series article #7745 of the Minnesota Agricultural Experiment Station.
Laboratory of Plant Hardiness, Department of Horticultural Science. The authors express their thanks to Dr. Sharon L. Desborough and other colleagues in the Laboratory of Plant Hardiness, Department of Horticultural Science, University of Minnesota, for their helpful comments and constructive criticism, to Dr. Nelson Estrada Ramos, National Director of Tuberous Crops, Instituto Columbiano Agropecuario, Bogota, Colombia for his assistance and the opportunity given the senior author to study in his laboratory, and to the Rockefeller Foundation for their support.
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